A '''wormhole''' is a hypothetical topology|topological
feature that would fundamentally be a shortcut through spacetime
. A wormhole is much like a tunnel with two ends, each in separate points in spacetime.
For a simplified notion of a wormhole, visualize space as a two-dimensional (2D) surface. In this case, a wormhole can be pictured as a hole in that surface that leads into a 3D tube (the inside surface of a cylinder). This tube then re-emerges at another location on the 2D surface with a similar hole as the entrance. An actual wormhole would be analogous to this, but with the spatial dimensions raised by one. For example, instead of circular holes on a 2D plane, the entry and exit points could be visualized as spheres in 3D space.
Researchers have no observational evidence for wormholes, but the equations of the theory of general relativity
have valid solutions that contain wormholes. Because of its robust theoretical strength, a wormhole is one of the...